| Effect of continuous cropping and irrigation way on soil microbial biomass carbon and nitrogen |
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| DOI：10.7606/j.issn.1000-7601.2010.04.38 |
| Key Words: cotton continuous cropping microbial biomass carbon and nitrogen irrigation way |
| Author Name | Affiliation | | SHAN Hongbin | College of Prataculture and Environmental Science，Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | LIANG Zhi | Institute of soil and Ferilizer，Xingjian Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | WANG Chunli | College of Prataculture and Environmental Science，Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHU Xinping | College of Prataculture and Environmental Science，Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | WANG Li | College of Prataculture and Environmental Science，Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | JIA Hongtao | College of Prataculture and Environmental Science，Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| By field sampling and indoor analysis methods, we have surveyed soil microbial biomass carbon and ni-trogen change in different duration of continuous cropping years and irrigation condition, and the results showed that:
Compared with wasteland, soil microbial biomass carbon and nitrogen both increase in cotton field, and with the increase of years for cultivation, the change laws of soil microbial biomass carbon and nitrogen are basically the same. The micro-bial biomass carbon and nitrogen are the lowest in the two-year continuous cropping, being 16. 22±0.77 mg/kg and 13.08±0.75 mg/kg respectively. With the extension of continuous cropping，microbial biomass carbon and nitrogen content continue to increase. In 15-year continuous cropping, the microbial biomass carbon and nitrogen get to the high-est points of 38.67±1.22 mg/kg and 23.39±0.65 mg/kg respectively , and then the soil microbial biomass carbon and nitrogen begin to decline . Compared to furow irigation, drip irrigation improves obviously microbial biomass carbon and nitrogen. Microbial biomass carbon has extremely obvious positive correlation with microbial biomass nitrogen, and the correlation coefficient is 0.951. It also has obvious positive correlation with soil total nitrogen and available nitrogen, and the correlation coefficients are 0. 863 and 0.854 respectively . Microbial biomass nitrogen has extremely obvious positive correlation with soil total nitrogen, available nitrogen, with the correlation coefficients being 0. 863 and 0.854 respectively. |
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